Predicted EC50 and EC95 of Remifentanil for Smooth Removal of a Laryngeal Mask Airway Under Propofol Anesthesia
- Authors
- Yoo, Ji Young; Kwak, Hyun Jeong; Lee, Kyung Cheon; Kim, Go Wun; Kim, Jong Yeop
- Issue Date
- 1-Jul-2015
- Publisher
- YONSEI UNIV COLL MEDICINE
- Keywords
- Laryngeal mask airway; effect-site concentration; general anesthesia; remifentanil; target-controlled infusion; device removal
- Citation
- YONSEI MEDICAL JOURNAL, v.56, no.4, pp.1128 - 1133
- Journal Title
- YONSEI MEDICAL JOURNAL
- Volume
- 56
- Number
- 4
- Start Page
- 1128
- End Page
- 1133
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/10344
- DOI
- 10.3349/ymj.2015.56.4.1128
- ISSN
- 0513-5796
- Abstract
- Purpose: The purpose of this study was to determine the effect-site concentration (Ce) of remifentanil in 50% of patients (EC50) and 95% of patients (EC95) for smooth laryngeal mask airway (LMA) removal in adults under propofol and remifentanil anesthesia. Materials and Methods: Twenty-five patients of ASA physical status I-II and ages 18-60 years who were to undergo minor gynecological or orthopedic surgery were assessed in this study. Anesthesia was induced and maintained with propofol and remifentanil target-controlled infusion (TCI). Remifentanil was maintained at a predetermined Ce during the emergence period. The modified Dixon's up-and-down method was used to determine the remifentanil concentration, starting from 1.0 ng/mL (step size of 0.2 ng/mL). Successful removal of the LMA was regarded as absence of coughing/gagging, clenched teeth, gross purposeful movements, breath holding, laryngospasm, or desaturation to SpO(2)<90%. Results: The mean +/- SD Ce of remifentanil for smooth LMA removal after propofol anesthesia was 0.83 +/- 0.16 ng/mL. Using isotonic regression with a bootstrapping approach, the estimated EC50 and EC95 of rernifentanil Ce were 0.91 ng/mL [95% confidence interval (CI), 0.77-1.07 ng/mL] and 1.35 ng/mL (95% CI, 1.16-1.38 ng/mL), respectively. Conclusion: Our results showed that remifentanil TCI at an established Ce is a reliable technique for achieving safe and smooth emergence without coughing, laryngospasm, or other airway reflexes.
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